Furnace attachment.



No. 760,542 Y PATENTED MAY 24, 1904. T. J. MARCH.

FURNACE ATTACHMENT. APPLICATION FILED 001 .9, 1903.

N0 MODEL.

' WITNESSES INVENTOR Patented May 24, 1904.

PATENT OFFICE.

THOMAS J. MARCH, OF POTTSTOWN, PENNSYLVANIA.

FURNACE ATTACHMENT.

SPECIFICATION forming part of Letters Patent N0. 760,542, dated May 24. 1904.

Application filed October 9,1903. Serial No. 176,422. (No model.)

To all whom it may concern..-

Be it known that I, THOMAS J. MARoI-I, a resident of Pottstown, in the county of Montgomery and State of Pennsylvania, have invented certain new and useful Improvements in Furnace Attachments; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improved furnace attachment, and more particularly to improved means for closing the air-inlet slide of a hot-air furnace when the ash-pit door is opened, and vice versa, the object of the invention being to provide improvements of this character which can be fastened to any ordinary furnace and which will effectually prevent the entrance of dust to the hot-air chamber and rooms when the ash door is opened and ashes are being removed and which will automatically open the slide when the ash-door is closed.

With this object in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view illustrating my improvements. Fig. 2 is a view in horizontal section, and Figs. 3 and 4 are enlarged detail views showing my improvements detached.

1 represents the casing of an ordinary furnace, having the fuel-door 2 and ash-pit door 3, and between the doors 2 and 3 an air-entrance slide 4 is located to provide an air-entrance to the hot-air chamber of the furnace. In the ordinary construction of furnace this is merely an auxiliary air-inlet, the main airsupply entering at the bottom of the furnacecasing and supplied thereto by a pipe communicating with the outside of the building. This slide 4 is ordinarily operated by hand and independent of the ash-pit door, and as the slide is often left open while removing ashes from the ash-pit the dust which consequently enters the hot-air chamber is scattered through the house, and it is to avoid any possibility of this condition of affairs that my invention was devised and will now be described.

To the slide 4 at one side adjacent to the hinged edge of door 3 a bracket 5 is secured and made with an integral forked or bifurcated lug 6 to receive the upright crank-pin 7 at right angles to and integral with a curved rod 8, which latter is normally disposed at an incline, as shown, and has a depending lip 9 at its forward edge projecting over the ashpit door and secured thereto.

In operation when the ash-pit door 3 is opened it swings the rod 8 to the left, and crankpin 7 moves the slide 4 to the left, closing the air-inlet. A further movement of the door 3 frees crank-pin 7 from lug 6, and the door is free to open to its full extent. When the door is closed, the pin 7 enters the lug 6 and pushes the slide to the right, opening the airinlet automatically. It will thus be seen that with my improvements, which can be attached to old furnaces as well as new ones, the ashpit door cannot be opened without closing the air-inlet slide, and vice versa, thus obviating the disagreeable scattering of dust through the house when removing ashes from the furnace and compelling the opening of the air-inlet when the door is closed.

Slight changes might be made in the gen eral form and arrangement of the parts described without departing from my invention, and hence I do not restrict myself to the precise details set forth, but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is I 1. In a furnace, the combination with an ash-pit door and an air-inlet slide, of means operated by the ash-pit door for closing the slide when the door is opened, and opening the slide when the door is closed.

2. In a furnace, the combination with an ash-pit door and an air-inlet slide to the hotair chamber, of a forked or bifurcated lug on the slide, and a rod secured to the door engaging said lug and adapted to close the slide when the door is opened and open the slide when the door is closed.

'3. In a furnace, the combination with an ash-pit door and an air-inlet slide to admit cold air to the hot-air chamber, of a bracket secured to the slide and having a forked or bifurcated lug thereon, a rod secured to the ash-pit door, and a crank-pin on said rod located in the bifurcated or forked lug whereby,

when the door is opened, the slide will be closed, and when the door is closed, the slide will be opened.

4. The combination with the ash-pit door and cold-air-entrance slide of a furnace, of an attachment, comprising a bifurcated or forked lug to be secured to the cold-air-entrance slide to the hot-air chamber, and a rod to be secured to the ash-pit door and having a crank-pin thereon to enter the bifurcated or forked lug and close the slide when the door is opened.

In testimony whereof I have signed this specification in the presence of tWo subscribing witnesses.

THOMAS MARCH.

WVitnesses:

JOHN R. SAYLoR, HENRY LATSHAR. 

